US5016727A - Method and device of seismic prospection in wells and particularly deviated wells - Google Patents

Method and device of seismic prospection in wells and particularly deviated wells Download PDF

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US5016727A
US5016727A US07/505,902 US50590290A US5016727A US 5016727 A US5016727 A US 5016727A US 50590290 A US50590290 A US 50590290A US 5016727 A US5016727 A US 5016727A
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Prior art keywords
probe
source
well
conductor cable
column
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US07/505,902
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English (en)
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Christian Wittrisch
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IFP Energies Nouvelles IFPEN
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IFP Energies Nouvelles IFPEN
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Assigned to INSTITUT FRANCAIS DU PETROLE reassignment INSTITUT FRANCAIS DU PETROLE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WITTRISCH, CHRISTIAN
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/14—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells for displacing a cable or a cable-operated tool, e.g. for logging or perforating operations in deviated wells
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B23/00—Apparatus for displacing, setting, locking, releasing or removing tools, packers or the like in boreholes or wells
    • E21B23/08—Introducing or running tools by fluid pressure, e.g. through-the-flow-line tool systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/40—Seismology; Seismic or acoustic prospecting or detecting specially adapted for well-logging
    • G01V1/52—Structural details
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S367/00—Communications, electrical: acoustic wave systems and devices
    • Y10S367/911—Particular well-logging apparatus

Definitions

  • the invention relates to a method and device for prospection in wells and particularly deviated wells, comprising the use of transmission-reception means located in the same well portion.
  • deviated wells should be understood to mean wells that are at least partially horizontal or very highly inclined with respect to the vertical.
  • the invention relates to the seismic recording of a subsoil zone through which a horizontal well portion passes, the investigation range and resolution being intermediate between those generally obtained with sonic well-logging probes and those which are possible using conventional seismic prospection methods at a great distance.
  • Well-logging tools generally comprise, in the same body, one or more transmission members capable of generating acoustic signals in a frequency range of about 20 to 25 kHz and one or more corresponding receiving members.
  • Such tools are well adapted to the fine study of wells or their immediate environment.
  • very low frequency seismic waves are usually used in the range between 10 and 200 Hz for example, with an attendant disadvantage of very poor resolution.
  • the seismic pulse source is generally disposed on the surface and the waves reflected by the underground discontinuities are picked up by one or more geophones housed in the body of the probe lowered into a well.
  • 4,394,754 may also be mentioned as describing the use in a well of an assembly formed of a transmitter emitting acoustic vibrations at a frequency of 1 kHz and two receivers spaced apart by a few meters. It should be noted that such an assembly is not adapted either for operating in very deviated well portions and that the distance between the transmitter and the receivers is here very small.
  • a seismic prospection method is described particularly applicable in well portions slightly inclined with respect to the horizontal. It comprises the use of one or more acoustic wave transmitters whose frequency is in the 5000 to 10000 Hz band and so below that in which well-logging probes generally operate.
  • the waves reflected by the discontinuities surrounding the well are received by one or more piezoelectric sensors.
  • the transmitters and receivers are disposed in a single well probe fixed at the end of a drill string and pushed as far as the deviated zone to be studied.
  • the maximum spacing between the transmitters and receivers is about 10 meters or so. Such an arrangement is suitable for obtaining well logs in a widened zone about a well.
  • the method according to the invention is well suited for exploration in wells and particularly in deviated well portions with acoustic waves in an intermediate frequency band between the very low frequency seismic band and the range of frequencies higher than 10 kHz generally used for sonic logging. It is characterized in that it comprises:
  • reception means having at least one probe with directional sensor means and means for applying said sensor means against the wall of the well, said probe being connected to a surface control device by a rigid column and being able to be mechanically uncoupled therefrom intermittently,
  • acoustic wave transmission means comprising at least one acoustic wave source inserted in the column between the probe and the control device,
  • a multi-conductor cable for connecting the transmission-reception assembly to a control and recording assembly disposed on the surface
  • a delayed connection system for automatically providing the electric connection between successively the source and the probe after the latter has been lowered into the well and between the control and recording assembly and said source after the latter has been lowered in the well
  • the exploration device comprises at least one well probe having a cross section adapted to that of the well to be explored with directional sensor means and means for coupling said sensor means with the wall of the well, a rigid tubular column for connecting the probe to a control installation on the surface, a multi-conductor cable for connecting the probe to a surface control and recording assembly. It is characterized in that it comprises transmission means inserted in said column between the probe and the control installation and comprising at least one wave source.
  • the device may for example comprise a delayed connection system for providing electric interconnection on the one hand between the source and the probe after the latter has been lowered into the well and on the other hand between the control and recording assembly and the source after the latter has been lowered into the well.
  • a delayed connection system for providing electric interconnection on the one hand between the source and the probe after the latter has been lowered into the well and on the other hand between the control and recording assembly and the source after the latter has been lowered into the well.
  • the probe and the source are associated respectively for example with two guide blocks each comprising a tubular body fixed to the rigid column and a guide element movable in the body between a withdrawn position and an advanced position, means for locking the two guide elements in the withdrawn position with respect to said tubular bodies and means, cooperating with the two guide elements for pushing the latter towards their respective advanced positions, the probe being mechanically uncoupled from the associated tubular body in said advanced position.
  • the connection system may comprise a first electric connection plug fixed to the guide element associated with the probe, a first electric socket usable in a liquid environment connected to a first multi-conductor cable element which is connected to said source, a second electric connection plug fixed to the guide element associated with the source, a second electric socket usable in a liquid environment and connected to a second multi-conductor cable element, which is connected to said central control and recording assembly, guide means for the first and second sockets permitting their electric connection to the two corresponding plugs and means for providing a flow of fluid in said column, so as to push said sockets towards their engagement positions in contact respectively with the two plugs, and means for locking said sockets in the engaged position.
  • the source comprises for example at least one vibrator of the piezoelectric or magnetostrictive type associated with means for generating continuous or pulsed vibratory signals or else a sparker.
  • the reception means may comprise several directional sensors such as geophones or accelerometers whose axes are directed in different directions, these sensors being disposed for example on a support which is orientable with respect to the body of the probe.
  • the source may comprise several elements spaced apart from each other along the rigid column. Similarly several probes may be spaced apart from each other along the rigid column.
  • the source is fixed to the body of its guide block and comprises a passage along its axis, for the combined displacement of the two guide elements when they are connected together by the multi-conductor cable, the device also comprising auxiliary conducting means for connecting the source to the same multi-conductor cable.
  • FIGS. 1A and 1B show an embodiment of the transmission-reception assembly comprising a transmission source and a measuring probe spaced apart from each other along a rigid column;
  • FIG. 2 shows a first step for positioning the probe in the well
  • FIG. 3 shows a second step where the source is added and connected to the probe
  • FIG. 4 shows a third step in which the transmission-reception assembly is connected to a surface control and recording assembly, after being brought as far as a very deviated well portion;
  • FIG. 5 shows the mechanical uncoupling of the probe before the beginning of the transmission-reception cycles
  • FIGS. 6 and 7 show two different methods of orientation in the directional sensor space included in each probe
  • FIG. 8 shows a method of installing sensors on an orientable support
  • FIG. 9 shows a method of installing several vibrators on an orientable support
  • FIGS. 10A and 10B show a second embodiment of the transmission-reception device.
  • FIG. 11 shows a partial view of the column connecting the source to the probe and having damping means.
  • the transmission-reception assembly shown in FIG. 1 in the interconnected position is adapted to be lowered into a well 1. It comprises a measurement probe 2 associated with a guide block 3 similar to that described in the published French patent application 2 609 105.
  • Guide block 3 comprises a tubular body 4 with an end-piece 5 at one end. The outer wall of this end-piece is widened. Its form is adapted to that of the end of the probe so as to center the latter when it bears against the end-piece.
  • a connection cable 6 passing through an opening 7 in endpiece connects the upper end of probe 2 to a guide element 8 movable inside the tubular body 4 between a withdrawn position (FIG. 1) and an advanced position closer to end-piece 5. Locking means lock the guide element 8 in the withdrawn position.
  • the guide element 8 comprises a multi-contact male plug 11 oriented along the axis of body 4 and a tubular extension 12 of a cross section less than that of body 4, ending in a collar 13. The latter abuts against an internal shoulder 14 of the body in the withdrawn position of the guide element.
  • Collar 13 serves for guiding a female socket 15 towards the male plug 11.
  • the female socket 15 is connected to the different conductors of a multi-conductor cable 16.
  • the socket 15 has mounted thereover a tubular weighting bar 17 of substantially equal cross section.
  • Locking means 18 lock the female socket to the guide element 8 when it is engaged on the male plug 11.
  • remote controllable dogs 18 can be used which engage in grooves 19 at the base of the tubular extension 12.
  • Openings 4a and 13a are formed in collar 13 and the wall of body 4 and the guide element has passing therethrough channels so that a fluid stream may flow between the inside and outside of the tubular column.
  • probe 2 comprises housings particularly for one or more directional geophones or accelerometers for picking up the acoustic waves reflected back by the discontinuities surrounding the well.
  • the length of body 4 and the possible stroke of guide element 8 between its locked withdrawn position and its advanced position in which it abuts against end-piece 5, are chosen so that the probe may be sufficiently removed from the tubular body 4.
  • the tubular body 4 is connected to a first tubular column or casing 20 formed by interconnecting several identical tube sections for example together.
  • a second guide block 21 comprising a tubular body 22 similar to body 4. It comprises a compartment 22a communicating with the outside of the body through longitudinal grooves 23 formed through its wall.
  • a seismic source 24 is disposed in compartment 22a.
  • a vibratory source may for example be used and particularly a magnetostrictive or piezoelectric constant frequency source. Its vibration frequency is chosen in the intermediate frequency range, i.e. of the order of a few kHz.
  • a sparker may also be used having a wide transmission spectrum.
  • the source is connected to a guide element 25 whose cross section is adapted to the inner section of the second tubular body 21.
  • this element 25 is fixed a multi-contact male plug 26 oriented along the axis of body 21 and disposed in the center of a tubular guide extension 27.
  • a collar 28 facilitates guiding towards plug 26 of a multi-contact female socket 29 connected to a second multi-conductor cable 30 for connecting the transmission-reception assembly 2, 24 to a central control and recording assembly 31 (C.F. FIG. 4) disposed outside the well.
  • the female socket 29 has mounted thereover a weighting bar 32 and comprises means for locking it in the plugged-in position which may be remote controlled from the surface.
  • These locking means may for example be electric dogs 33 engaging in matching grooves 34 situated at the base of the tubular extension 27.
  • the electric continuity between the contacts of the male plug 26 and the conductors of cable 16 is provided by conducting lines disposed inside source 24 and not shown.
  • the guide element 25 is also provided with locking means 35 which may be remote controlled from the surface, formed for example by electric dogs which engage in grooves 36 formed in the wall of the second tubular body 21.
  • locking means 35 which may be remote controlled from the surface, formed for example by electric dogs which engage in grooves 36 formed in the wall of the second tubular body 21.
  • the assembly formed by source 24 and its guide element 25 is able to move inside body 21 between a withdrawn position in which collar 28 abuts against a shoulder 27 of the inner wall and in which the locking means face the grooves 36, and an advanced position.
  • the travel distance of this assembly 24, 25 in body 22 between the two positions is substantially equal to that of the guide element 8 inside the first tubular body 1.
  • collar 28 and the wall of the second body comprise openings 28a, 21a and the guide element 25 has channels 25a passing therethrough so that a fluid stream may be formed between the inside and outside of tubular body 21.
  • the latter at its end opposite source 24, is connected to a second tubular column of casing 38 formed by interconnection of tube sections and making it possible by successive additions to conduct the transmission-reception assembly as far as the depth required even in very deviated well portions.
  • the operation is carried out using a handling device 39 (FIG. 4) of a type known per se in the drilling field.
  • the multi-conductor cable 30 unwinding from reel 40 is lowered as far as the second body 21 along column 38.
  • connection between the third multi-conductor cable 30 and the central assembly 31 is facilitated by using a special connection with lateral window 40, known by specialists as side entry sub, shown schematically in FIG. 4.
  • lateral window 40 known by specialists as side entry sub, shown schematically in FIG. 4.
  • hydraulic propulsion is preferably used.
  • Column 34 is capped by an injection head 42. The fluid stream formed inside the column and return takes place through orifices 28a and 21a, channels 25a through guide element 25 and the annular space between the column and the well.
  • Probe 2 may comprise anchorage arms 43 folded along the body during lowering thereof.
  • An electro-hydraulic control system of the type described for example in the French patent 2 501 380 may be used for moving arms 43 apart. Opening act of the arms results in applying the body of the probe against the wall of the well during the successive transmission-reception cycles.
  • the anchorage arms 43 may also be offset as shown in the French patent 2 609 100.
  • the probe may advantageously comprise several directional sensors whose axes are disposed so as to pick-up signals in several different directions.
  • Tri-axial geophones and/or accelerometers may for example be used whose axes are orthogonal two by two (see FIG. 6) or else blocks of four sensors C1, C2, C3, C4 whose axes are in the same plane at 45° from each other, as shown schematically in FIG. 7.
  • the assembly of sensors is preferably disposed on an orientable support 44 (FIG. 8) which may be brought into a given angular position with respect to the body of probe 2 by actuating an electric motor 45. The action on the motor for introducing an appropriate angular correction is determined by orientation measurement using a known type pendulum 46.
  • Source 24 may be omnidirectional but, in the same way, a source may be used (FIG. 9) formed of one or more transmission elements E1, E2 mounted on a support 47 which can be oriented by the action of an electric motor 48 which is remote controlled from the surface.
  • the indications concerning the effective orientation of the transmission units E1, E2 are measured by an angular deviation measurement means such as a pendulum 49 and transmitted to the operator by the multi-conductor cable 30.
  • the positioning of the transmission-reception device in an inclined well portion is achieved as described hereafter and illustrated in FIGS. 2-5.
  • Probe 2 fixed to its guide block 3 is first of all inserted into well 1.
  • the assembly is lowered to a given depth (FIG. 2).
  • first female socket 15 is inserted into the well at the end of the second multi-conductor cable 16. Weighted by bar 17, it descends under its own weight until it is engaged on the male plug 11. The locking means 18 are then actuated so as to secure plug 11 to the first tubular body 4. Then the second tubular body 22 containing the source 24 is fixed to column 20 (FIG. 3).
  • the second tubular body 22 is connected to a first casing section and, by successive connections, the second rigid column 38 is formed.
  • the transmission-reception assembly 2, 24 is lowered to the well portion where the seismic prospection operations are to be carried out (FIG. 4).
  • the special connection 41 is positioned.
  • the third multi-conductor cable 13 having at its end the second female socket 29 weighted by its bar 32 is introduced into column 38.
  • the special connection 41 is covered with an injection head 42 and a fluid stream is formed so as to propel the weighted socket 29 towards the male plug 26 at the lower end of column 38 until the connecting means 33 are locked.
  • the transmission-reception assembly is then operative.
  • source 24 is fixed in the lower portion of the second tubular body 21.
  • a passage 50 is formed along its axis for cable 16 connecting together the two guide elements 8 and 25 in operation so as to permit simultaneous displacement thereof when a tractive force is exerted on cable 30 by means of the control device 39 (FIG. 4).
  • the electric power supply for source 24 is provided by a secondary connection means disposed between the source and the multi-contact plug 26 of the guide element 25.
  • This connection means comprises a junction box 51 for connecting one or more contacts of the multi-contact plug 26 to a secondary control cable 52 connected to source 24. Cable 52 is sufficiently loose to allow movement of guide element 25 inside body 22.
  • the method of progressively positioning the transmission-reception assembly is practically the same as that described above.
  • source 24 is preferably connected to probe 2 by a column portion 20 having signal damping means so as to attenuate or delay the waves which are propagated along the tubes or in the fluid of the well.
  • a column portion 53 may for example be used (FIG. 11) whose wall is provided, in an arrangement known per se, with openings 54 such as thin slits spaced apart about its periphery.
  • the connection between the source and the probe may further be formed by a column portion made from a material capable of damping the vibrations or else by coating with layers of damping materials.
  • the probe 2 is first of separated from its guide block 3.
  • the arms 43 of probe 2 may also be anchored to the wall of the well by raising column 30 so as to bring the guide element 8 into abutment against end-piece 5.
  • the two operations are combined for facilitating extraction.
  • Cable 6 is then slackened so as to mechanically uncouple the body of the probe 5 from the guide block 3 and remove the probe body from the vibrations of the rigid column 30, 38.
  • the signals received by the directional sensors C are transmitted to the central control and recording assembly 31 by conductors incorporated in cables 6, 16 and 30.
  • the electric connection between these conductors and assembly 31 is provided in a way known per se by a set of brushes rubbing against collector rings fast with the shaft of reel 36.
  • the weighted socket 29 By acting on the locking means 33, the weighted socket 29 is released and cable 30 is raised. After the second body 22 has returned to the surface, the weighted socket 15 is released. The transmitter portion of the device may then be removed from column 20. The withdrawing operation continues until probe 2 returns to the surface.
  • the method described makes it possible to obtain particularly interesting seismic profiles when the well is horizontal or very deviated and when it is desired to recognize precisely, and in zones which would otherwise be difficult to explore by sounding, geological formations such as the roof of a reservoir or layers located on each side of the horizontal or highly inclined portion of the well.
  • a transmission frequency in the 200 to 2000 Hz band has been chosen preferably.
  • resolution is obtained between 0.35 and 3.75 m.
  • the useful range of the waves is 50 to 100 m and their power of resolution is about 1 m.
  • measurement probes such as probe 2 may be used held spaced apart along the well by fairly rigid connection means for transmitting the axial thrusts required for advancing the device but capable of attenuating the direct transmission therebetween of the waves received.
  • the device according to the invention lends itself well to operations in very deviated wells. It may however of course be used in vertical or substantially vertical wells.
  • the examples described relate to a transmission-reception device having seismic or acoustic wave transmission-reception means. Still within the scope of the invention, the means described may be replaced by any other signal transmission-reception means of any type for benefiting from the advantages related to the overall structure of the device.

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  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Acoustics & Sound (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
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US07/505,902 1989-04-06 1990-04-06 Method and device of seismic prospection in wells and particularly deviated wells Expired - Lifetime US5016727A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8904554 1989-04-06
FR8904554A FR2645583B1 (fr) 1989-04-06 1989-04-06 Methode et dispositif de prospection sismique dans des puits et notamment des puits devies

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US (1) US5016727A (de)
EP (1) EP0391809B1 (de)
CA (1) CA2014045C (de)
DE (1) DE69009574T2 (de)
FR (1) FR2645583B1 (de)
NO (1) NO300859B1 (de)

Cited By (14)

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US5550785A (en) * 1992-06-12 1996-08-27 Institut Francais Du Petrole Mobile seismic system of great length for wells
US5563846A (en) * 1994-09-23 1996-10-08 Texaco Inc. Method and apparatus for well logging to obtain high-resolution seismic images of geological formations surrounding horizontal well bores
US5585556A (en) * 1994-12-05 1996-12-17 Norsk Hydro A.S. Method and apparatus for performing measurements while drilling for oil and gas
US5810080A (en) * 1995-11-10 1998-09-22 Institut Francais Du Petrole Device for exploring an underground formation crossed by a horizontal well comprising several anchorable sondes
US6419013B1 (en) * 1998-11-28 2002-07-16 Reeves Wireline Technologies Ltd. Well logging method & apparatus
US20030172743A1 (en) * 1999-04-01 2003-09-18 Xiaolei Ao Clamp-on flow meter system
US20040017730A1 (en) * 2002-04-25 2004-01-29 Baker Hughes Incorporated System and method for acquiring seismic and micro-seismic data in deviated wellbores
US20040123666A1 (en) * 2002-12-31 2004-07-01 Ao Xiaolei S. Ultrasonic damping material
US20050270172A1 (en) * 2001-07-13 2005-12-08 Exxonmobil Upstream Research Company Method and apparatus for using a data telemetry system over multi-conductor wirelines
WO2010130269A2 (de) * 2009-05-11 2010-11-18 Helmholtz-Zentrum Potsdam Deutsches Geoforschungszentrum -Gfz Verfahren und vorrichtung zur seismischen erkundung einer geologischen formation
CN101349758B (zh) * 2007-07-18 2011-08-03 中国石油天然气集团公司 一种双相控声波发射装置的控制方法
US20120230151A1 (en) * 2007-12-26 2012-09-13 Almaguer James S Borehole Imaging And Orientation Of Downhole Tools
WO2017173299A1 (en) * 2016-03-31 2017-10-05 Scientific Drilling International, Inc. Method for improving survey measurement density along a borehole
CN107290778A (zh) * 2017-06-14 2017-10-24 四川大学 一种机械耦合式微震监测系统

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FR2668793B1 (fr) * 1990-11-02 1995-12-15 Inst Francais Du Petrole Dispositif perfectionne d'intervention dans des puits de production devies non eruptifs.
FR2688027B1 (fr) * 1992-02-27 1994-04-15 Institut Francais Petrole Support et connecteur d'un cable interne a une conduite, systeme et methode de mesure.

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US4578785A (en) * 1983-06-06 1986-03-25 Western Geophysical Company Of America Two-component acoustic borehole tool
US4588243A (en) * 1983-12-27 1986-05-13 Exxon Production Research Co. Downhole self-aligning latch subassembly
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US4701890A (en) * 1985-12-17 1987-10-20 Schlumberger Technology Corporation Device for locking a set of gimbal-mounted detectors
US4799546A (en) * 1987-10-23 1989-01-24 Halliburton Company Drill pipe conveyed logging system

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FR2547861B1 (fr) * 1983-06-22 1987-03-20 Inst Francais Du Petrole Methode et dispositif de mesure et d'intervention dans un puits
FR2598817B1 (fr) * 1986-05-16 1988-07-15 Elf Aquitaine Procede de prospection sismique a tres haute resolution en forages horizontaux.
FR2609105B1 (fr) * 1986-12-31 1990-10-26 Inst Francais Du Petrole Methode et dispositif pour effectuer des mesures ou/et interventions dans une portion de puits fortement inclinee et son application a la realisation de profils sismiques

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US4349072A (en) * 1980-10-06 1982-09-14 Schlumberger Technology Corporation Method and apparatus for conducting logging or perforating operations in a borehole
US4690214A (en) * 1983-04-07 1987-09-01 Institut Francais Du Petrole Method and a device for carrying out measurements and/or operations in a well
US4578785A (en) * 1983-06-06 1986-03-25 Western Geophysical Company Of America Two-component acoustic borehole tool
US4588243A (en) * 1983-12-27 1986-05-13 Exxon Production Research Co. Downhole self-aligning latch subassembly
US4701890A (en) * 1985-12-17 1987-10-20 Schlumberger Technology Corporation Device for locking a set of gimbal-mounted detectors
US4799546A (en) * 1987-10-23 1989-01-24 Halliburton Company Drill pipe conveyed logging system

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5550785A (en) * 1992-06-12 1996-08-27 Institut Francais Du Petrole Mobile seismic system of great length for wells
US5563846A (en) * 1994-09-23 1996-10-08 Texaco Inc. Method and apparatus for well logging to obtain high-resolution seismic images of geological formations surrounding horizontal well bores
US5585556A (en) * 1994-12-05 1996-12-17 Norsk Hydro A.S. Method and apparatus for performing measurements while drilling for oil and gas
US5810080A (en) * 1995-11-10 1998-09-22 Institut Francais Du Petrole Device for exploring an underground formation crossed by a horizontal well comprising several anchorable sondes
US6419013B1 (en) * 1998-11-28 2002-07-16 Reeves Wireline Technologies Ltd. Well logging method & apparatus
US6578631B2 (en) * 1998-11-28 2003-06-17 Reeves Wireline Technologies, Ltd. Well logging tool
US7000485B2 (en) 1999-04-01 2006-02-21 Ge Infrastructure Sensing, Inc. Flow measurement system with reduced noise and crosstalk
US20030172743A1 (en) * 1999-04-01 2003-09-18 Xiaolei Ao Clamp-on flow meter system
US20050270172A1 (en) * 2001-07-13 2005-12-08 Exxonmobil Upstream Research Company Method and apparatus for using a data telemetry system over multi-conductor wirelines
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NO300859B1 (no) 1997-08-04
EP0391809A1 (de) 1990-10-10
FR2645583B1 (fr) 1991-07-12
CA2014045A1 (fr) 1990-10-06
CA2014045C (fr) 2000-10-24
DE69009574D1 (de) 1994-07-14
EP0391809B1 (de) 1994-06-08
NO901540D0 (no) 1990-04-04
NO901540L (no) 1990-10-08
DE69009574T2 (de) 1994-09-22
FR2645583A1 (fr) 1990-10-12

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